EntryId format in OST/Exchange files

Feb 25, 2011 at 4:09 PM

Hi Guys,

It seems like the format of the EntryId for message is different between OST-Exchange files and PST files.

When i use a ost file of an exchange account, the Message.EntryId generates and returns a value which is different than the entry-id value I actually see in Outlook.

It's not the same entry-id for sure as the value in outlook is 140-length while the Message.EntryId value is only 48-length.

This works fine for PST files and return the correct value.


Is there any way we can get the correct entry-id for a message in exchange ost file?

Do you know how it can be extracted?


Feb 25, 2011 at 4:14 PM

Unfortunately, OST files, while very similar to PST files, have some minor differences. One of those differences is how it calculates EntryIDs.

Microsoft has not yet released documentation on OST files, so we don't know what that formula looks like, and as such can't implement OST support.