Then they marched to Logar and Chahar Asyab a stronghold of Gulbudin, they forced Gulbudin out in a fierce fight, Gulbudin then pulled back to another of his base in Sorobi, not sure if you have heard of this place, in sorobi a commander of Gulbudin called Zardad was in controll. A taste of his cruelty, murder and looting is still in people's mouth. After this point Gulbudin went to see Masoud and they forged an alliance against the Taliban until the taliban took kabul. This alliance lasted for years to come, although Gulbudin didnt have any forces on ground to fight the taliban-it was mostly political from this point. Now gulbudin have some fighters but too weak compare to the past, a few months back Gulbudin and Taliban's fighters clashed badly and as a result they both lost many dozens of men and many of Gulbudin's men surrendrd to the Gov to put pressure on the taliban.
The Columbia World Dictionary of Islamism reports that having lost Saudi support when it supported Saddam Hussein and Pakistani support after 1994, "the remainder of Hizb-i Islmi merged into al-Qaeda and the Taliban."The Jamestown Foundation describes it having been "sidelined from Afghan politics" for a decade or so after the Taliban takeover of Kabul. Hekmatyar opposed the 2001 American attack on Afghanistan and since then has aligned his group with remnants of the Taliban and al-Qaeda against the current Afghan government.
Source: Wikipedia
here is something intersting:
Hekmatyar`s men supplying Taliban intelligence to Nato: officials | Latest news, Breaking news, Pakistan News, World news, business, sport and multimedia | DAWN.COM
i googled alot , but i couldnt find the interview of gulbudin's rep in kabul that clearly denied their alliance with the taliban.