From where can I download MAPI33.dll. I got the link http://www.mapi33.adexsolutions.com/ from a site but it seems this is not correct.
Answer
You can find an older version here:
The newest version must be bought.
I cite:
The following code samples might be obsolete. They might not work with current version of the mapi33 dll, though they will still work using the out-of-date (but quite well-working and free) version of the mapi33 dll included in the samples zip file.
To get up-to-date information about the mapi33 dll and to buy the most recent version, visit the mapi33 website at http://www.mapi33.adexsolutions.com/
The link to the company homepage seem to be outdated.
The samples link however is not. It can be found under section 4 there or as a direct link here:
http://g8.cx/mapi/ExtendedMapiWithCSharp_sourcecode.zip
I verified that the samples link was working when I wrote this.