This can have more Reasons:
Outlook is in the Autostart or you start it directly after the system start.
P: Outlook start to fast and before the act! service is started.
S: Don´t use the Autostart and / or wait while all services are been loaded.
Using a Quick Sync or Quick Start Tool
P: all these tools load Outlook without Add-Ins.
S: Start Outlook without such tools.
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