Challenge
Cannot browse backups of Office 365 mailboxes that have been made in December 1-8, 2017.
Solution
1. Make sure you have Veeam Backup for Office 365 version 1.0.0.912 or 1.5.0.1099
2. Download and unpack hotfix here
3. Install VeeamBackupOffice365_1.5.0.1309.msi and VeeamExplorerExchange_9.6.0.1308.msi
4. Confirm the backup can be browsed
If there are any remote proxies in use:
1. After both .msi files are installed, stop Veeam Backup Proxy for Microsoft Office 365 Service on the Remote Proxy Server
2. Copy all files (C:\Program Files\Veeam\Backup365\Packages\Proxy) from Server that has Veeam Backup for Microsoft Office 365 Service running to remote Proxy (C:\Windows\Veeam\Backup365Proxy)
3. Start Veeam Backup Proxy for Microsoft Office 365 Service
4. Confirm the backup can be browsed