IMAP storage issue

Mudesira Munir
Mudesira Munir used Ask the Experts™
on
One of our customer has configured his Exchange account through IMAP. 
Now is the problem that his imap account on the pc says that there is 9.92 GB data , but in our server this is 9.26 GB 
So IMAP says to have more then our server, do you know how this is posssible and why it does not sync with the exchange server? 
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Business Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018
Commented:
That is pretty close in size. Could be an older email in IMAP that downloaded to the PC and is no longer syncing, and could be an attachment in such older email not syncing.
Alexei KuznetsovMicrosoft Outlook MVP
Commented:
It's OK. Local IMAP cache (OST file) contains more data (metadata, format specifics, etc.)
Shaun VermaakTechnical Specialist
Awarded 2017
Distinguished Expert 2018

Commented:
The OST database and IMAP mailbox are different formats and save things differently
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Alexei KuznetsovMicrosoft Outlook MVP

Commented:
Nope, Shaun. Outlook uses local OST cache for IMAP mailboxes.
Shaun VermaakTechnical Specialist
Awarded 2017
Distinguished Expert 2018

Commented:
If you prefer, the online mailbox and the OST are different formats
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
@Mudesira Munir  - Thank you and I was happy to help.

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