Errors on Public Folder Migration

As I was doing a public folder migration today, I got a couple of errors that took me some time to resolve. These are caused by mail enabled public folders migrated from Exchange 2003. You will see these errors when you run Get-MailPublicFolder on Exchange 2010. Some of these errors will show up in the public folder migration logs when migrating to Exchange 2016. So, I prefer to clean these up first to ensure migration is successful.

Error #1

WARNING: The object domain.com/Microsoft Exchange System Objects/PF Name has been corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Could not convert property OnPremisesObjectGuid to type Guid. Byte array for GUID must be exactly 16 bytes long.

My best guess is that this property is left over from Exchange 2003 (or maybe earlier). The quick fix is to disable mail for the public folder and then mail-enable it again. However, when you do so, verify the email addresses before and after.

Error #2

WARNING: The object domain.com/Microsoft Exchange System Objects/PF Name has been corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Property expression "PF Name" isn't valid. Valid values are: Strings formed with characters from A to Z (uppercase or lowercase), digits from 0 to 9, !, #, $, %, &, ', *, +, -, /, =, ?, ^, _, `, {, |, } or ~. One or more periods may be embedded in an alias, but each period should be preceded and followed by at least one of the other characters. Unicode characters from U+00A1 to U+00FF are also valid in an alias, but they will be mapped to a best-fit US-ASCII string in the e-mail address, which is generated from such an alias.

This error is most commonly caused by a space in the Alias property. Update this property to remove spaces and the error should be gone.