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Migrating to Exchange Online through hybrid - Import PSTs before or after migration? RRS feed

  • Question

  • Hi,

    We are going to set up Exchange 2013 Hybrid.

    We have a lot of users who have large PST files.

    What is the best strategy? 

    1) First import the PST files in Exchange 2013 mailboxes and then migrate the mailboxes

    or 

    2) First migrate the mailboxes and then use the PST import functionality in Office 365 ?

    Thanks for your input!


    Kind regards!

    Friday, August 11, 2017 3:51 PM

Answers

  • Hi,

    We are going to set up Exchange 2013 Hybrid.

    We have a lot of users who have large PST files.

    What is the best strategy? 

    1) First import the PST files in Exchange 2013 mailboxes and then migrate the mailboxes

    or 

    2) First migrate the mailboxes and then use the PST import functionality in Office 365 ?

    Thanks for your input!


    Kind regards!

    1. I would rather import PSTs to a local destination, then move the mbx.

    This assumes you have the storage capacity now. If not, then 2.


    Friday, August 11, 2017 5:18 PM
    Moderator

All replies

  • Hi,

    We are going to set up Exchange 2013 Hybrid.

    We have a lot of users who have large PST files.

    What is the best strategy? 

    1) First import the PST files in Exchange 2013 mailboxes and then migrate the mailboxes

    or 

    2) First migrate the mailboxes and then use the PST import functionality in Office 365 ?

    Thanks for your input!


    Kind regards!

    1. I would rather import PSTs to a local destination, then move the mbx.

    This assumes you have the storage capacity now. If not, then 2.


    Friday, August 11, 2017 5:18 PM
    Moderator
  • Hi Andy, thanks for your input.

    Do you have any reason why you would go with approach 1 (first importing the PST)? 

    Isn't there more risk that migration will be delayed (or even break) when the mailboxes are very large? 

    Saturday, August 12, 2017 7:15 AM
  • Hi Andy, thanks for your input.

    Do you have any reason why you would go with approach 1 (first importing the PST)? 

    Isn't there more risk that migration will be delayed (or even break) when the mailboxes are very large? 


    Nope. 365 can handle it fine. I would prefer that to importing PSTs. 
    Saturday, August 12, 2017 12:37 PM
    Moderator
  • Ok, thanks. Sounds good.

    Last concern: considering the fact that PSTs usually contain older and larger e-mails which have a higher potential of containing corruptions or being too big, I might have to raise the bad/big item limit a lot to avoid migration interruptions, don't you think? 

    Does PST import also consider bad items like a migration does? 

    Thanks again for your help.

    Saturday, August 12, 2017 3:22 PM
  • Ok, thanks. Sounds good.

    Last concern: considering the fact that PSTs usually contain older and larger e-mails which have a higher potential of containing corruptions or being too big, I might have to raise the bad/big item limit a lot to avoid migration interruptions, don't you think? 

    Does PST import also consider bad items like a migration does? 

    Thanks again for your help.

    Yes. So you should set that limit to something you can tolerate. The important thing to remember that any bad items are probably not viewable by the client regardless so they wont miss them.

    Saturday, August 12, 2017 3:35 PM
    Moderator
  • Ok, thanks for all the replies. Much appreciated!
    Saturday, August 12, 2017 3:50 PM