[horde] Errors Preventing Upgrade To Horde 5

[Gordon Dickens]

I am currently running Horde 4 and I am receiving errors each time that 
I attempt to upgrade to Horde 5. I am using the following upgrade command:

pear upgrade -a -B horde/webmail

The errors are lengthy, however, here are the first failing packages in 
the error report:

horde/horde_datatree requires package "horde/Horde_Core" (version >= 
1.0.0, version <= 2.0.0, excluded versions: 2.0.0), downloaded version 
is 2.0.2
horde/Horde_Core cannot be installed, conflicts with installed packages
horde/content requires package "horde/Horde_Core" (version >= 
2.0.0beta1, version <= 3.0.0alpha1, excluded versions: 3.0.0alpha1), 
installed version is 1.9.0
horde/webmail requires package "horde/content" (version >= 2.0.0, 
version <= 3.0.0alpha1, excluded versions: 3.0.0alpha1), installed 
version is 1.0.3
horde/webmail requires package "horde/horde" (version >= 4.0.14, version 
<= 5.0.0, excluded versions: 5.0.0), downloaded version is 5.0.1
horde/horde cannot be installed, conflicts with installed packages
horde/webmail requires package "horde/imp" (version >= 5.0.20, version 
<= 6.0.0, excluded versions: 6.0.0), downloaded version is 6.0.1
horde/imp cannot be installed, conflicts with installed packages
horde/webmail requires package "horde/ingo" (version >= 2.0.7, version 
<= 3.0.0, excluded versions: 3.0.0), downloaded version is 3.0.1
horde/ingo cannot be installed, conflicts with installed packages
horde/webmail requires package "horde/kronolith" (version >= 3.0.16, 
version <= 4.0.0, excluded versions: 4.0.0), downloaded version is 4.0.1
horde/kronolith cannot be installed, conflicts with installed packages
horde/webmail is not compatible with downloaded package "horde/mnemo" 
version 4.0.0
horde/mnemo cannot be installed, conflicts with installed packages
horde/webmail is not compatible with downloaded package "horde/nag" 
version 4.0.0
horde/nag cannot be installed, conflicts with installed packages
horde/kronolith is not compatible with downloaded package 
"horde/timeobjects" version 2.0.0
horde/webmail is not compatible with downloaded package 
"horde/timeobjects" version 2.0.0
horde/timeobjects cannot be installed, conflicts with installed packages
horde/webmail is not compatible with downloaded package "horde/turba" 
version 4.0.0
horde/turba cannot be installed, conflicts with installed packages
horde/content requires package "horde/Horde_Date" (version >= 1.0.0, 
version <= 2.0.0, excluded versions: 2.0.0), downloaded version is 2.0.1
horde/nag requires package "horde/Horde_Date" (version >= 1.0.0, version 
<= 2.0.0, excluded versions: 2.0.0), downloaded version is 2.0.1

Does anybody have any recommendations for fixing these errors?  I 
realize that horde_datatree support has been removed so is that my 
problem? If so, how do I resolve it?

Thanks,

Gordon