Body of email is missing in Outlook

Symptom:
The AVG or NOD32 or GDATA add-in deletes the message body.

Solution:
To remove an add-in:

Outlook 2007: Tools > Trust Center > Add-ins
Outlook 2010/2013/2016: File > Options > Add-ins

In the Manage field choose COM add-ins and click Go
Highlight an add-in and click Remove

Source:
intermedia.net

Duplicate emails in Sent Mail folder when sending from Outlook with Gmail account

Symptom:
Duplicate emails in Sent Mail folder when sending from Outlook with Gmail account.
(Delivery just once, but store twice.)

Solution:
Go to File => Account Settings => Account Settings => (your gmail account) => Change… => More Settings… => Special => Sent Items and then check the option "Do not save copies of sent items"."

Settings of different Outlook versions:
https://www.msoutlook.info/question/prevent-duplicate-sent-items-gmail

Source:
superuser.com

Is my Microsoft Office 32-bit or 64-bit version?

How to find if your Microsoft Office is 32-bit or 64-bit version?
How do I know if my Office is 32-bit or 64-bit?

Open an Office app e.g. Word.
Click on "File", than “Account” and “About Word”
See the first row.

Email includes a Winmail.dat attachment

Reason and solution of "email received from a sender using Outlook includes a Winmail.dat attachment" on Microsoft Knowledge Base here.

If there is no possibility to ask for resending email, you can open winmail.dat attachment with these softwares:

Winmail.dat Reader

Winmail Opener

Thunderbird Add-on: LookOut

And an online solution: http://www.winmaildat.com/

Outlook error message: "Cannot start Microsoft Outlook" and "You need more memory or system resources. Please close some Windows and try again."

Outlook error message:
"Cannot start Microsoft Outlook"

These attempts were innefective:
Repair
Safe mode: outlook.exe /safe
Outlook /resetnavpane
Turn off Aero mode

Last I tried to make a new profile to start Mail in Control panel, but I got another error message:
"You need more memory or system resources. Please close some Windows and try again."

Solution:
Rename this registry key:

Outlook 2010 and older:

HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem


Outlook 2013:

HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Profiles

Rename it ProfilesOLD (Right click, rename.)
Then you can start Mail, and make new Outlook profile.

Warning:
Your settings in former Outlook profile will be deleted...
It's recommended to make a backup from all .pst file before you do anything.

Source: slipstick.com

Microsoft Outlook 2013 error message "Cannot open the Outlook window. The set of folders cannot be opened. The information store could not be opened"

Check Outlook compatibility mode:
Open: C/Program Files/Microsoft Office/Office 15/Outlook.exe.
64 bit system: C:/Program Files x86/Microsoft Office/Office 15/Outlook.exe.
Right click on Outlook.exe and click on Properties and then click on Compatibility tab.
Check if you have any check mark in any of the compatibility mode options.
Make sure you also click on the option "change settings for all users" tab at the bottom of the same screen and look for similar check boxes in the window.
If you see any check boxes in the compatibility mode options, uncheck all the boxes.
Apply
OK.
Try to open Outlook and check the result.

Source and other solutions: answers.microsoft.com

Outlook 2010 error message: " invalid XML the view cannot be loaded "

Search programs and files
Type:

Outlook /resetnavpane

Enter

Source: Microsoft

E-mail messages stuck in Outbox: Outlook 2010 / 2013 vs. Norton Internet Security

Regular solutions for "messages stuck in Outbox" problem at Microsoft:
How to troubleshoot e-mail messages that are stuck in your Outbox

But if you use a complex antivirus software, e.g. Norton Internet Security, turn off scanning of outgoing messages:
Settings
Network
Message Protection

Error message when you try to send or to receive email in Outlook 2010 or Outlook 2013: 0x8004010F: Outlook data file cannot be accessed.

Error message when you try to send or to receive email in Outlook 2010 or Outlook 2013:
"0x8004010F: Outlook data file cannot be accessed"

Set up again the profile with correct settings.
Set as default.
You must delete demaged profile (email account, e.g.: IMAP).
After that, emails from "Outbox" folder will be sent out automatically.

Source: Microsoft

Move Outlook information to another computer that has Outlook 2010 installed

Microsoft Outlook 2003, 2007, 2010
Move Outlook information to another computer that has Outlook 2010 installed
http://office.microsoft.com/en-us/outlook-help/move-outlook-information-to-another-computer-that-has-outlook-2010-installed-HA102544948.aspx

Microsoft Outlook 2003
Copy Autocomplete name list to another computer
http://office.microsoft.com/en-us/outlook-help/copy-autocomplete-name-list-to-another-computer-HA001139451.aspx

Microsoft Outlook 2003
Copy the AutoComplete list to another computer
http://office.microsoft.com/en-us/outlook-help/copy-the-autocomplete-list-to-another-computer-HA010097887.aspx