Microsoft Project Online Is Retiring September 30, 2026

Yes: Microsoft Project Online is retiring, and the date is fixed. September 30, 2026. Microsoft confirmed the retirement and has announced no extension, no successor upgrade path, and no exception process. If your PMO runs on Project Online today, this is not a rumor to monitor. It is a deadline to plan against.

This post is the short orientation: what changes on the day, what survives, who is affected, and the three realistic paths forward. The deeper guides for each step are linked throughout; if you only read one page about the retirement before briefing your team, make it this one.

What changes on September 30, 2026

The retirement is a hard cutover, not a gradual wind-down. These services stop simultaneously:

Everything on the left breaks at once, because it all depends on the same service. There is no partial mode where the schedules stay readable but the timesheets stop. When the service retires, the scheduling database behind it becomes unreachable from the live tenant.

The full hour-by-hour breakdown of the shutdown sequence is in what actually happens after Project Online retires, and Microsoft's own statement is worth reading in the original for stakeholder conversations.

What this means in practice

Every PMO on Project Online is affected, but not equally. The heaviest impact lands on organizations using the parts of Project Online that have no equivalent in Microsoft's successor products: multi-project portfolios with governance gates, costed timesheets driving billing, the Enterprise Resource Pool, Enterprise Custom Fields with lookup tables, and Power BI dashboards built against the OData feed.

The export deadline is earlier than the retirement date. OData is throttled, and every Project Online customer on the planet will be exporting in September. The practical deadline to have your data fully extracted and verified is September 1, 2026. The data export deadline analysis covers the throttling math; the step-by-step .mpp export procedure and the OData export guide are the how-to companions, and the complete data export pillar covers the full extraction scope end to end.

There is no in-place upgrade. Microsoft's positioning points customers toward the new Planner, but that is a different product on a different architecture, not an upgrade. Whatever you choose, this is a migration project with an inventory, a destination decision, a pilot, and a cutover.

Your three realistic paths

Three honest options exist, and the right one depends on how your organization actually uses Project Online today:

1. Microsoft Planner Premium (the rebranded Project for the Web). A real option for teams that used Project Online as a rollup of simple task lists. Not a fit for schedule-driven PMOs: no critical path, one baseline, FS-only dependencies without lag, no resource pool, no timesheets, no portfolio governance. The honest Project Online vs Planner comparison covers the gap feature by feature.
2. A modern PM platform built for the migration. For PMOs that need scheduling depth (all four dependency types with lag, baselines, critical path, resource management, governance), the realistic path is a third-party platform that imports your .mpp files and OData exports. Onplana is purpose-built for this case; the broader alternatives roundup scores the market honestly.
3. A custom build. Defensible only for engineering-heavy organizations with genuinely idiosyncratic needs and the appetite to maintain internal tooling for a decade. For everyone else, the build vs buy math rarely favors building.

The clock, counted backwards

A standard Project Online migration runs about 12 weeks for a 50-500 project PMO: inventory, evaluate, pilot, cutover prep, cutover, stabilise. Counting back from a cutover with safety margin (end of August, leaving September as buffer), the comfortable start window is now. Later starts compress the pilot, and a compressed pilot is the single most common cause of failed cutovers.

If you are starting today, three links do most of the work:

• The plan: the 90-day migration plan with weekly checklists and phase gates.
• The inventory: the 35-item migration checklist covering the projects, fields, workflows, and integrations admins most often miss, with a free interactive version.
• The budget: the six-category cost breakdown with a free calculator that produces a CFO-ready estimate.

For the widest view, the complete Project Online migration guide covers the whole journey, and the migration hub is the entry point to every resource. The retirement itself is one of three related Microsoft retirements landing in 2026; the consolidated retirement timeline maps all three, and the definitive retirement FAQ answers the questions this overview deliberately keeps short.

The one-sentence version for your leadership

If you need to compress this entire page into a briefing line: Project Online stops working on September 30, 2026, with no extension and no upgrade path; our data must be out by September 1, and a standard migration takes twelve weeks, so the decision clock is running now.

That sentence has moved more migration projects off dead center than any feature comparison. The deadline is not negotiable; the only variable is how prepared you are when it arrives.

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Microsoft Project Online™ is a trademark of Microsoft Corporation. Onplana is not affiliated with Microsoft.