No, compacting Outlook emails does not harm them. Compacting emails simply reduces the size of the Outlook data file, which can help improve performance and free up disk space. Compacting emails does not delete any emails, but it does remove any deleted items from the data file.
we can save several emails information by use of outlook express.
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Yes, you can run the MS-Outlook and Outlook Express are on the same computer as both are different platform for email communication. Both email client help users to store and access emails from the server, but these both email client uses the different file format to save their database. For more about Outlook Express & MS-Outlook, go to the source link.
Versions of Outlook Express are specific to Operating systems. You may have a version not suited for your operating system. Outlook Express also gets viruses. Run your anti-virus software. Microsoft tried to correct this by going over to Hotmail. There is also a new version of Outlook Express for Windows 7.
It's most likely a setting you need to change.
what is the difference between outlook and outlook express
PST is the file format which is created by Microsoft Outlook to save its entire database such as contacts, emails, attachments, notes, images etc.On the other hand, Outlook Express stores and saves their data into a DBX file format.To know more difference about MS-Outlook and Outlook Express, read the KB article about Microsoft support (From the given source):
Some of the important file extensions of Outlook and Outlook Express are mentioned as below :Microsoft Outlook :Outlook Data File (.pst)Offline Folder File (.ost)Personal Address Book (.pab)Offline Address Books (.oab)Messages (.msg, htm, .rtf)Stationary (.htm)Rules (.rwz)Outlook Express :Outlook Express data file (.dbx)Email Files (.eml)Email messages as text files (.txt)Address book (.wab)Contact information (.vcard)Internet Account files (.iaf)
By far the biggest disadvantage is that it localizes your email and contacts on a particular computer's hard drive. It downloads all emails from your specified email account onto one computer, which means that you can't access that email address from another computer without messing up your Outlook Express inbox. In other words, if you open/read an email message on a different computer, that message will not appear in your Outlook Express inbox.
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When sombody sends you one
Outlook! In The Old Versions Of Windows It Was Called "Outlook Express"