Была такая же шляпа при запуске Outlook 2016.
Решение Windows Search Service :
Exit Outlook.
Start Registry Editor. To do this, use one of the following procedures, as appropriate for your version of Windows.
Windows 8: Press Windows Key + R to open a Run dialog box. Type regedit.exe and then press OK.
Windows 7, Windows Server 2008, or Windows Server 2012: Click Start, type regedit.exe in the search box, and then press Enter.
In Registry Editor, locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Windows Search
Point to New on the Edit menu, and then click DWORD (32-bit) Value.
Type PreventIndexingOutlook, and then press Enter.
Right-click PreventIndexingOutlook, and then click Modify.
In the Value data box, type 1, and then click OK.
On the File menu, click Exit to exit Registry Editor.
https://docs.microsoft.com/en-us/out...office-outlook