Outlook Mac Crashes after Aug 17 Update - On launch I get a spinning wheel, or hundreds of windows open before I force Quit

Exception: SIG_FORCE_QUIT
ExceptionEnumString: 268435456
Exception Code: 0x00000001 (0x000000010529a000)
Date/Time: 2017-08-24 01:29:10 +0000
Application Name: Microsoft Outlook
Application Bundle ID: com.microsoft.Outlook
Application Signature: OPIM
Application Bitness: x64
Application Version: 15.38.0.17082200
Crashed Module Name: merp
Crashed Module Version: 15.38.0.170822
Crashed Module Offset: 0x00000000000030fa
Blame Module Name: MicrosoftOffice
Blame Module Version: 15.38.0.170822
UnsymbolicatedChecksum: 7540889F0F030B28C6575C90479F72A1
Blame Module Offset: 0x000000000001c4c3
StackHash: ffffce51_main
Application LCID: 1033
Extra app info: Reg=en Loc=0x0409
Build Type: SHIP
Audience: Insiders_DevMain
AudienceGroup: DevMain
AudienceChannel: Insiders
Crashed thread: 0