The SAP Migration Rush of 2026 Is Testing Your Calendar, Not Your Technical Skills
It is Tuesday morning in April. You have an architecture review at 9:00 with the SAP program office at a large chemical company near Frankfurt. At 10:30, your contact at a Munich-based automotive supplier needs you on a call to sign off on a blueprint document before their steering committee meets on Thursday. And somewhere in between, a financial services firm in Zurich has been trying to schedule you for a project kickoff that has already been delayed twice. Three clients, three Outlook instances open on your screen, and a growing sense that the next double-booking is not a question of if but when.
This is the daily reality for senior SAP consultants in DACH right now. The 2027 end-of-mainstream-support deadline for SAP ECC 6 is no longer a future problem — it is an active one. Organisations that want to complete their S/4HANA migration before SAP pulls the plug need to be in full project execution by mid-2026 at the latest. A full enterprise migration takes 18 to 36 months. The math is uncomfortable. And it means the most experienced SAP consultants are not choosing between projects right now — they are managing two or three of them at the same time.
The technical challenge of that work is well understood. What gets far less attention is what happens to the scaffolding around that work: specifically, your calendar.
The Perfect Storm: Why 2026 Is Different
The SAP talent shortage in the DACH region has been building for several years, but 2026 represents a qualitative shift. Demand for S/4HANA specialists with deep implementation experience is projected to reach three times the available supply by 2027. Senior architects, functional leads, and change management consultants with real rollout experience are being approached not by one client but by several simultaneously.
This is not a short-term peak driven by a single market event. It reflects a structural reality: large German, Austrian, and Swiss enterprises were slow to begin their S/4HANA migrations, and the urgency has now become acute across the entire market at once. Consultants who in previous years would take one engagement at a time are now structuring their work as a portfolio: running a Siemens-adjacent project in parallel with a mid-market rollout in Switzerland while also supporting a Roche subsidiary in between.
At €900 to €1,200 per day for senior profiles, the economics make this portfolio approach genuinely attractive. The operational complexity is another matter entirely.
Why Your Calendar Is the First Thing to Break
When you work on a single engagement, calendar coordination is a manageable inconvenience. You have one corporate environment, one Outlook profile, one set of colleagues who can see your availability in Exchange and book around it. The system is imperfect but legible.
The moment you take on a second or third client, the legibility collapses. Each corporate client maintains its own Microsoft Exchange infrastructure. In large German enterprises especially, this is not an accident of legacy technology but a deliberate architectural and security decision, reinforced by Betriebsrat agreements that govern what external parties can access or integrate with internal systems. You cannot connect these environments. You are not supposed to. And even if IT were willing to make an exception, the works council agreement would close that door before it opened.
So you work with what you have: three separate Outlook windows, or three browser-based webmail tabs, or a painstaking manual practice of blocking time on each calendar independently every time something changes on any of the others. You become the synchronisation layer between three sealed corporate systems.
The problem with being the synchronisation layer is that you are human. You forget to block. You block the wrong day. You accept a meeting in one calendar without checking the other two. Or you check all three before saying yes, but one of the clients moves their call and the update only lands in one inbox.
Double-bookings in a consulting context are not just inconvenient. They signal to clients that their project does not have your full attention. In high-stakes SAP transformation projects, where stakeholder trust is fragile and program offices are watching every signal, showing up late to a steering committee because you were finishing a call with a different client is a reputational event, not just a scheduling mishap.
The DSGVO Dimension Nobody Talks About Openly
There is a second layer to this problem that most consultants understand intuitively but rarely articulate: data protection. Each client’s calendar is not merely a scheduling tool. It is a record of who is meeting with whom, when, about what, and with which external parties present. The meeting metadata alone can reveal organisational structure, project priorities, vendor relationships, and budget cycles.
Under DSGVO, this information belongs to the data subjects involved and falls under the control of the organisation that operates the calendar system. When you, as a freelance consultant, run a calendar synchronisation tool that pulls availability data from one client’s Exchange environment and transmits it to a third-party cloud service, you have potentially become a data processor for that client’s personal data without a formal Data Processing Agreement in place.
Most off-the-shelf calendar sync tools do not ask you to sign a DPA with your enterprise clients before you start. Most enterprise clients do not know you are using one. This is not a hypothetical compliance gap. It is the kind of thing that surfaces during audits, due diligence processes, or when a project ends on poor terms and the client’s legal department begins reviewing what external parties had access to.
The Thing Nobody told you
Here it is, stated plainly: the compliance structures that prevent you from syncing across corporate calendars were not designed to inconvenience you specifically. They exist because corporate meeting metadata is genuinely sensitive, and any tool that reads it and transmits it elsewhere creates a data trail that neither you nor your client fully controls. Working around those restrictions does not just expose your clients. It exposes you.
The Betriebsrat agreement blocking you from integrating with the client’s Exchange is not bureaucratic friction. It is, in a meaningful sense, protecting you as well. Your client’s meeting data is your client’s data, and you do not want to be the freelancer who inadvertently turned into a data breach incident.
What the Smartest Multi-Engagement Consultants Actually Do
Given these constraints, there are a few approaches that work in practice without requiring you to either violate security policies or spend three hours every week in manual calendar maintenance.
The first is disciplined time-blocking at the week level rather than the day level. Rather than trying to keep all three calendars in real-time sync, experienced multi-client consultants establish recurring blocked periods in all environments before each week begins. Monday evenings become the coordination checkpoint. Each calendar gets protected focus blocks, client-specific windows, and buffer zones for context switching. The goal is not granular synchronisation but structural legibility: anyone in any of your three client environments can see that you are unavailable on Tuesday afternoon without knowing why.
The second approach is anchor scheduling. Identify the fixed, immovable commitments in each engagement first — steering committees, weekly standups, key stakeholder reviews — and protect those across all calendars as untouchable. Everything flexible is booked around the anchors. This single practice eliminates perhaps 60 to 70 percent of double-booking risk before you have even opened your inbox.
The third approach, which a growing number of DACH-based consultants with complex multi-client portfolios are beginning to use, involves tools designed to operate within corporate IT constraints rather than around them. Rather than connecting to calendar APIs or requiring OAuth tokens that trigger IT security reviews, these solutions work by being invited as a calendar participant and creating anonymous time blocks across client environments without ever requiring system-level access. No integration configuration, no API credentials, no conversations with six different IT departments, no DPA to negotiate. The result is not perfect synchronisation but something more practically useful: visible unavailability that each client can respect, without exposing anyone’s data to anyone else’s systems.
Building a Sustainable Rhythm for the Long Game
The SAP migration wave is not resolving itself in the next six months. If current trajectories hold, the peak of engagement demand in DACH will extend well into 2027, with some organisations running into the extended support window and contracting accordingly. If you are a senior consultant in this space, multi-client work is not a temporary situation you are managing through. It is the structure of your professional life for the foreseeable future.
That reframes the calendar coordination question from a logistics problem into a professional sustainability problem. Burnout among senior freelancers in intensive transformation projects almost always follows a specific pattern: not too many billable hours in isolation, but cognitive fragmentation. The experience of constantly switching context, never feeling fully present in any single engagement, and spending disproportionate mental energy on coordination rather than contribution.
Protecting your calendar is, in this framing, not about being organised for its own sake. It is about maintaining the conditions under which you can do the work that clients are actually paying for. A double-booking is not merely a scheduling error. It is a signal that the operational scaffolding has become too complex to maintain through willpower alone.
Senior consultants who build sustainable multi-project practices share a few recognisable characteristics. They are explicit with clients about how their availability works across engagements. They communicate proactively when project calendars conflict rather than hoping nobody notices. They invest in the operational infrastructure of their freelance practice with the same rigour they bring to client deliverables. And they choose their tools based on what actually works inside the constraints of corporate environments rather than on what looks most impressive in a product demo.
What This Means for the Rest of 2026
The S/4HANA migration wave is one of the most consequential restructuring events in enterprise IT in Germany in a generation. For the consultants at the centre of it, the professional stakes are high, the demand is real, and the competition for the best engagements is tight. The sustainable advantage in this market belongs not just to the specialists who have mastered the technical architecture of a clean core migration, but to those who have also figured out the personal architecture of working effectively across multiple demanding client environments simultaneously.
If you are navigating exactly this situation and looking for a cleaner way to keep your availability coherent across corporate calendars without touching anyone’s security policies or DSGVO obligations, Calendar Butler was built for this specific problem. It works the way your clients‘ IT departments actually permit: no integrations, no APIs, just a calendar participant that blocks time on your behalf.