Issue description
The current two-year Exchange Online Global Retention Policy (GRP) is not suitable for certain workflows that involve high volume mailbox accounts, issues from this can affect all account types including: User, Shared, Application and Resource mailboxes.
Latest update and guidance
This issue is being investigated under PRB0183368.
The current workaround is to create new temporary mailboxes as and when required which can then be used as a replacement until a longer term solution is deployed.
The previous workaround which involved temporary exclusion from the GRP and running ManagedFolderAssistant is no longer valid due to inconsistent behaviour which is currently being investigated.
The NHSmail team are currently working with Microsoft to investigate a longer term solution to this issue.
