Csdrhrt

I have a situation where a customer changed their primary SMTP domain.

Some users have send as rights to various mailboxes so they have the From: button displayed.
The From button displays the old primary address due to the profiles having been set up long before the address change took place.

The change was from name@old-ddmmain.com to name@new-domain.com

I'm hoping there's a registry entry that will allow a change for that email address to the new one, without having to create a new outlook profile.

The environment is Exchange 2010 SP3, clients are Outlook 2010.

I don't have the same environment as you (Office 365 and Outlook 2013), so I will provide the steps I used to retrieve my answer. Your mileage may vary along with the usual caveats about the dangers of changing values in the registry directly versus using the application.

The change the e-mail name from Outlook 2013, I go to:

• File > Account Settings


• Select Account Settings from dropdown


• In Email tab, go to More Settings


• Change the e-mail name.

In my example, I added 01234567890 to my e-mail. You can see when I create a New Email, the name is appended with the numbers. This does not change the actual FROM e-mail Outlook 2013, but just the name.

For this sequence, I used Process Monitor from SysInternals (procmon) to monitor the file and registry activity where the process name contains outlook and category is write:

For me, I found that when I changed the e-mail address to the new value, this registry changed:

HKCUSoftwareMicrosoftOffice15.0OutlookProfilesOutlookfc9a8ceae2b34f449fc525e570d01fcf

001f6620 = name@new-domain.com (Type = REG_BINARY)

Since you are using Outlook 2010, the registry path will be different, especially the 15.0 part.

Please be careful with remote registry changes. Always test first.

I checked this with the same method as sunk818 but found slightly different results:

If you only change the value 001f6620 this will have the effect that if you go to the Account Settings afterwards, and try to change it manually, the change field, but only that will reflect your changes.

To also Update the from adress name and account name I had to change the additional key "Account Name" for me (Outlook 2010) both keys were found under

HKCUSoftwareMicrosoftWindows NTCurrentVersionWindows Messaging SubsystemProfilesOutlook

in different subkeys. So far I have not found a really good method for identifying which subkey guid has to be used. The best I could come up with was either check all occurences of 001f6620 for the wrong mail or use the subkey that contains a key 001e6750 with value "Outlook".

For the Account Name it seems to be even harder. It is the only guid that has again several subkeys in the format "0000000X" and there for me it was the highest numbered one and the one containing a key "Identity Eid" that has a complex value including the words "exchange". It might be also wise to just iterate through all those folders and check all account names here.

Finally keep in mind that those are binary values and depending on the method you try to update those with the characters have to be spaced with trailing 00 because the binary format allows for formats that use more bits per character than ascii.

In conclusion I can only repeat sunk818's warning. I do not find registry changes in general to be problematic but in this case it's very hard to identify the correct keys and then they are even stored in non string format, so be very careful if you change things automatically here.

HKCUSoftwareMicrosoftWindows NTCurrentVersionWindows Messaging SubsystemProfilesOutlooke6ee84559d879548bc05573166e74d2101f6620

e6ee84559d879548bc05573166e74d21 = der Ordner wo der REG_SZ 001e6750 mit Value Outlook exisitert

HKEY_USERSS-1-5-21-1874162390-2186939667-310645977-48933SoftwareMicrosoftWindows NTCurrentVersionWindows Messaging SubsystemProfilesOutlook9375CFF0413111d3B88A00104B2A66760000003Account Name

9375CFF0413111d3B88A00104B2A6676 = Der einzige Ordner mit Unterordnern

00000003 Der Ordner wo Identity Eid existiert mit Wert enthält EXCHANGE