If you mean across the network, the easiest solution is either NFS or SAMBA.
http://www.kempston.net/solaris/samba.html
If you want a little help with Samba on Solaris.
As for direct mounting it (same computer, not across a network), here's something I dug up using google.
(This is presuming you have support for the pcfs.)
--begin paste--
mkdir /Windows
mount -F pcfs /dev/dsk/c0d0p0:c /Windows
or you can make this mount automatically during boot by adding a line to the /etc/vfstab :
/dev/dsk/c0d0p0:c - /Windows pcfs - yes -
--end paste---
A few other tips:
run a
[i]man mount_pcfs [i]
for more information.
You might also check out these sites for more information.
http://mtools.linux.lu/
and
http://www.sun.drydog.com/faq/
Oh, and presuming you have proper support for ext2, you can do a normal
mount -t ext2 /device/partition /mount/path
Changing the /device/partition and /mount/path where appropriate.