Vista Home Premium.

Apparently this problem is documented back to 2007, but getting ridiculous now. I don't remember the date of the Window Update, but after one of them Thunderbird email client began to slow when sending any emails. It is now at the point where about 10% of the emails I send will Time-Out and the others take a brutally long time for the mail to be delivered. Makes no difference if it's a one word email or large one with an attachment.
I routinely compact the TBird folders, I tried deleting the .msf files and restarting, clearing cache, etc.
BTW, I tried getting answers via Mozillazine but the responses have not helped in the slightest and generally very uninformative.

Any help would be greatly appreciated.



-Mark

Arvin-

Thank you for the reply. I have never deleted the XUL.mfl file. I was not aware that it was to be deleted on a routine basis???? I am visiting the tutorial you provided the link for at the present time.

Again, thank you.

-Mark

Arvin-

I downloaded and installed Thunderfix. Backed up everything important to me and ran the program. VOILA! I sent 6 emails, three with attachments, and replied to 3 others. Each one was sent quickly.
Per the suggestions of many I had deleted the .msf file associated with the sent folder and it never resulted in an increase in speed. Interestingly, Thunderfix reported twenty nine (29) instances of .msf files in the Thunderbird Profile folder. Apparently there was an .msf that I was not aware of and its departure has resulted in a smooth operating client once again.

Thank you very much for your help. I cannot begin to tell you how much I appreciate it.

-Mark