exchange 2013, outlook 2013

before trying to move mailbox to a different database, i need to reduce the size.Currently the email box is very hard to work upon, it goes into loop as soon as we open an email. Working on each email itself taking about 10 minutes with such performance moving data from 2012 with each month having an average of 4k to 5k emails is very difficult task.

I don’t think we can move them manually and also I don’t want to take the risk of losing any emails during manual process.

Later, I was able to create a folder in the online archive and then initiated the transfer but in between again the Outlook crashed on my computer. After which I checked the transfer didn’t complete.

As the mailbox has huge amount of emails is there any way I can reduce mailbox size.
pramod1Asked:
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pramod1Author Commented:
Today when I tried to move the folder from the mailbox to the online archive it gave the following error.

cannot copy the folder as it has private items
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pramod1Author Commented:
sorry we have exchange 2010 sp3
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Wayne88Commented:
You don't move it.  You should be able to compact it from the Data File windows in Outlook :

https://www.msoutlook.info/question/compact-now-pst-and-ost

How many mailboxes do you need to reduce in size?
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FOXActive Directory/Exchange EngineerCommented:
Open the suspect mailbox in OWA>click Filter>Sort by Size(make sure the arrow is pointing up so you get the largest emails)if not click it again...you don't want the "tiny" emails

Select one of the emails and then ctrl A(to select all)
Right-Click> Archive
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Wayne88Commented:
Actually, the compacting may not be what you want because you will require to compact, export, then import to the new DB but it will reduce the mailbox size.

A second thought would be to move the emails from a certain mailbox by date range so you can move partial at a time.  Do you want to move this directly from DB to DB?
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pramod1Author Commented:
are u sure  no data will be lost in the process of compacting the OST file .Plus in selecting all in the sort by size catalog and click on archive through webmail .
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pramod1Author Commented:
yes from 1 db to another db
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MASEE Solution Guide - Technical Dept HeadCommented:
You can move all mailboxes from one database to another which will save your whitespace in the database.
https://www.experts-exchange.com/articles/31741/Move-mailboxes-in-bulk-to-another-database-in-Exchange-2010-2013-2016.html
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Wayne88Commented:
There's no data loss when compacting.
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pramod1Author Commented:
I came to know somemailbox data are already corrupted so will compact work?
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Wayne88Commented:
If the mailbox data is already corrupt from the start then no I don't recommend compacting as it won't fix the initial problem.
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MASEE Solution Guide - Technical Dept HeadCommented:
Corrupted items will be ignored when you move with baditem limit.
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pramod1Author Commented:
while compacting u mean?
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Wayne88Commented:
MAS suggestion is probably a good idea so you wouldn't have to deal with bad items manually and it directly move from db to db.
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pramod1Author Commented:
u mean all the mailboxes in that db where that mailbox is sitting , I cant move  that mailbox because it is 26 gb to another db

so how come idea of moving all mailboxes??
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