Exchange 2010, Sync problem

[rush_tech]

being a exchange newbie a quick question, one of our users keeps getting email with the subject Synchronization Log with the following content

09:37:22 Synchronizer Version 14.0.6109
09:37:22 Synchronizing Mailbox 'USER'
09:37:22 Synchronizing local changes in folder 'Outbox'
09:37:22 Uploading to server 'SERVER '
09:37:22 Synchronization of some deletions failed.
09:37:22 [0-130]
09:37:22 1 item(s) deleted in online folder
09:37:22 Done

Could someone point me in the right direction please to stop these emails

Thanks

[sukh]

What's in the Outbox?

Tried to recreate the OST?

[rush_tech]

There is nothing in the outbox locally or on the server. I've not tried recreating the OST, I'll give that ago