Data File Management confusion after migration

Not open for further replies.


New Member
Outlook version
Email Account
At home I run Outlook 2007 on a standalone Windows 7 laptop. Up until today I had two accounts which I synced to Outlook 2007 with the Outlook/Hotmail connector. All worked well.

A few weeks ago I got an email message from Microsoft explaining about how my accounts would become inaccessible soon and explaining what to do. (I believe this event is called 'migration'?). Yesterday in Outlook 2007 one of my accounts became inaccessible. So today I tried to follow Microsoft's procedure, taking the option which involved removing the inaccessible account in Account Settings and then adding a new profile (which I called 'Outlook 2015') via Windows Control Panel/Mail.

All seemed to go well, although when I first fired up Outlook 2007 using my new 'Outlook 2015' profile, I was surprised that Outlook spent perhaps 15-20 minutes populating the folder structure with all my old email messages. (Microsoft didn't warn me about that.) But I can now send and receive emails and, as I say, I can see all my old emails.

One new thing: now in Data File Management there is an additional entry for an outlook.ost file in 'c:\users .... Microsoft\Outlook' which is set as the default. Whereas prior to today in Data File Management there were two entries for my two email account (with the filename listed as 'not available') plus an entry for 'Current - outlook.pst in c:\outlook data\' which was set as the default. This is the pst file I backup regularly. I assume it's where all my data is. It made sense for it to be the default.

However now, today, if I fire up Outlook 2007 with the 'Outlook 2015' profile and go into Data File Management and try to set the default back to 'Current - outlook.pst in c:\outlook data\' I get the following error message:

The Personal Folders File (.pst) you selected does not match the format of your Offline Folders File (.ost) To correct this, select a Personal Folders file that supports Unicode or disable the use of offline folders.

Is this how things are supposed to be, with both a pst file an ost file now showing in Data File Management? Is there anything of concern in that error message? Is it OK if the ost file is the default? It all looks a bit weird to me.

Thank you.

PS: Prior to today I'd never heard of ost files nor had I ever done anything with profiles with Outlook 2007.

PPS: I hope I posted this in the right place.
I think I've solved the problem I outlined in my OP.

I've converted the pst file from ANSI (97-2002) format to Unicode. Now I no longer get that Mail Delivery Location error message.

I think I'm starting to understand what's happened historically. Two years ago I changed from using email via my own domains and I went over to email accounts. At the same time I started using the Outlook Connector to sync the messages into Outlook 2007. What I think I understand now is that at that point Outlook 2007 started working in a different way. It created an ost file and started storing offline copies of my email messages in it. Before then, when I had my own domains, it was storing the email messages in the pst file.

And the current migration to Office 365/Exchange is kind of a continuation of this - in that it's now normal for Outlook 2007 to have both an ost and a pst file.

Anyway I'm thinking out loud here - in case it helps any Outlook 2007 simpletons like me out there reading this who aren't super clued-up about Outlook either.

Not open for further replies.
Similar threads
Thread starter Title Forum Replies Date
R Data File Management Using Outlook 1
C Advanced search terms for "Outlook Data File" Using Outlook 1
W Create a Quick Step or VBA to SAVE AS PDF in G:|Data|Client File Outlook VBA and Custom Forms 1
Wotme create email only data file Using Outlook 1
V Backup Calendar, Contacts, Tasks in an POP3 data file Using Outlook 3
J Deliver new messages to New or Existing Data File? Using Outlook 2
T vba extract data from msg file as attachment file of mail message Outlook VBA and Custom Forms 1
D Outlook 2016 Unable to load Outlook data pst file Using Outlook 5
RBLampert Assigning a newly (re)created e-mail account to a specific .pst data file Using Outlook 2
E Copying data from e-mail attachement to EXCEL file via macro Outlook VBA and Custom Forms 38
K How to access emails found to be located in "Top of Outlook data file"? Using Outlook 3
Diane Poremsky Set Another Data File as Default When Using an Exchange Account Using Outlook 0
Diane Poremsky How to Compact the Data File When you Close Outlook Using Outlook 0
J create .pst data file for new gmail account Using accounts in Outlook 1
M Dilemma: to add to existing data file or not to? Using Outlook 16
S Outlook data file cannot be accessed message Using Outlook 5
L outlook data file confusion Using Outlook 1
O Win10 Office 2013 Outlook Calendar Data File? Using Outlook 1
Diane Poremsky Change Item Count on All Folders in a Data File Using Outlook 0
G Calendar does not point to deafult data file Using Outlook 0
R can I transfer outlook data from old pc by using .ost file instead of the .pst Using Outlook 5
JulieB Default data file won't change Using Outlook 6
Diane Poremsky Moving an Outlook offline data file (*.ost) Using Outlook 3
C After a virus attack, The file... is not an Outlook data file (.pst) Using Outlook 1
H Can't change the location of the Data File (.ost) in Outlook 2013 Using Outlook 2
R Outlook 2013 asking for outlook data file password, there is no password Using Outlook 2
reefclaw Outlook 2013 Cannot set account as default data file Using accounts in Outlook 3
O "Cannot create message because a data file...could not be found" Using Outlook 1
J How do I get the database tool to recognize my data file? BCM (Business Contact Manager) 2
R Body of email not visible in Outlook Data File Sent Folder Using Outlook 4
P Error Message “Your Outlook Data File cannot be configured” Using Outlook 5
S Outlook 2010 trying to default Data file to calendar Using Outlook 6
V Odd data file? Using Outlook 5
C Help with a Macro to move emails to a different PST data file Using Outlook 4
V How can I start a NEW PST file without loosing my contacts & other data Using Outlook 3
evdbogaard How can I use data from a xml file in an email message? Using Outlook 0
P outlook data file casnnot be accessed Using Outlook 2
V Outlook Data File (PST) - Auto Backup Solution Using Outlook 3
L Data file not associated with an email account and can't be deleted Using Outlook 15
M How do I Repair OST File from corruption and Recover OST data? Using Outlook 3
E Can't Set a Particular Account as an Outlook Data File Using Outlook 1
V Outlook 2010 IMAP Sent Items some items appear in Outlook Data File Using Outlook 3
B Remove Outlook data file using another PC Using Outlook 1
T How To Delete AN Email Acoount Without Losing The Data File? Using Outlook 1
E Macro to export BCM business data to CSV file BCM (Business Contact Manager) 1
W Cannot delete Outlook 2010 data file Using Outlook 1
C crash during account setup - can't delete corrupted account/data file Using Outlook 13
T Default account - Outlook Data File Using Outlook 1
B Question: Boogered email/data file accounts Using Outlook 5
A Outlook 2010 - can't send/receive data file cannot be accessed Using Outlook 10

Similar threads