Most import change will be ppolicy definition is included by default. So if you have definitions in your slapd.d you will need to remove it and rebuild your slapd.d before you attempt to start it.

From: Quanah Gibson-Mount <quanah@fast-mail.org>
Sent: Wednesday, January 24, 2024 10:56 AM
To: kalybox2020@gmail.com; openldap-technical@openldap.org
Subject: [EXTERNAL] Re: Upgrade Openldap software from 2.4 to 2.6

--On Wednesday, January 24, 2024 12: 07 AM +0000 kalybox2020@ gmail. com wrote: > Hello, > I would like to upgrade the openldap software from 2. 4 to 2. 6 version. > Can you please describe the high level steps involved? > Is it going

 
 
--On Wednesday, January 24, 2024 12:07 AM +0000 kalybox2020@gmail.com wrote:
 
> Hello,
> I would like to upgrade the openldap software from 2.4 to 2.6 version.
> Can you please describe the high level steps involved?
> Is it going to be in place upgrade?
> Or we need to install a new 2.6 instance and export the data from old 2.4
> and import into 2.4? Pleas elet me know
 
I would start with reading the UPGRADE section of the Admin guide for 
OpenLDAP 2.5, since that covers moving from OpenLDAP 2.4 to OpenLDAP 2.5. 
You may also find <https://urldefense.com/v3/__https://repo.symas.com/soldap2.5/upgrading/__;!!AnfM!oHD-aQrHCGQGr7bf3VqaZDJAaVoIoMwTPyyDS88TPluL32IWzU52G6LNhGx6t5DWj1qyEwT03LEs$> useful.
 
Regards,
Quanah