WordPress site and Forum in Sub domain

[innofidelity]

I have a web site www.mydirectoyzzz.com (Eg site) instaled wordpress and directory theme on that. i wanna add forum to this web site phpbb or similar .so how can i use forum in main domain .wanna know how it works best for SEO

1. www.mydirectoyzzz.com/forum   or  www.forum.mydirectoyzzz.com ?

2. Adding forum to main site .is that harmful to main web site ?

Looking for SEO Expert help.

[mhadaily]

1. should be better if you install forum in subdomain

2. no it is not but you should strive to get rank for subdomain as well as main domain .

I recommend you to install a better forum like VBulletin or ... .

[MoosaHemani]

Obviously it really depends on what you really want from that forum... but in a normal state it is always good to go for sub directories instead of subdomain...

Matt Cutts of Google also did a post on his blog regarding this you can read it here http://www.mattcutts.com/blog/subdomains-and-subdirectories/ and i guess this will help you more...

Hope this helps!